[Xmonad] darcs patch: add XWMHints bindings

Below is a patch to X11-extras to allow reading/writing of the XWMHints struct. I would like to see this used to add UrgencyHint support to xmonad (I have a patch pending for that). I went with a fairly simple serialization (rather than fancy Maybe or Bool records) because xmonad won't care about most of these values, and hence I felt it wasn't worth the effort to provide much more than bare metal. Thoughts? (If you have any experience writing Haskell/C bindings, I'd apreciate your input. I'm new.) Wed Oct 10 00:45:01 EDT 2007 Devin Mullins * add XWMHints bindings also added withdrawnState, normalState, and iconicState, which are somewhat related